Silhouettes of animals or trees or land formations, especially against fading light can make extremely warm images. If you can add colour to the background, which is easy during sunrise or sunset, the silhouette becomes even more interesting. However, monochrome, well composed silhouettes can be as interesting. Start looking beyond the obvious. While metering the camera pretend that the dark objects are non-existent. In other words meter the brighter parts of the frame.

Lesser Whistling Teals waiting for the early morning sun to illuminate the surroundings so that they can go about their daily chores - feeding, courting, mating and avoiding predators.